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We experimentally and theoretically study coupled semiconductor ring lasers. We report on the destabilization of unidirectional operation for large coupling strengths and the appearance of a coupling-induced bidirectional state, both undesirable for optical memory operation.
A new snail laser geometry is modelled and presented, exhibiting stable, unidirectional lasing at both 1550 nm and 808 nm. We have calculated the fundamental mode thresholds and output power for Semiconductor Snail Laser (SSL) as a function of device parameters, i.e. coupler efficiency and output facets reflectivities. The coupler efficiency is the fraction of light transmitted between the waveguides...
Semiconductor ring lasers (SRLs) are a particular class of lasers whose cavity has a circular geometry. From a theoretical point of view, SRL attracted interest due to their intrinsic Z2 symmetry; on the other hand, the bistability between two counter-rotating modes makes SRLs ideal candidates to efficiently store bits of information in an all-optical way [1,2].
Semiconductor ring lasers (SRL) are interesting devices from the technological point of view because they do not require cleaved facets or gratings in order to achieve the necessary optical feedback for lasing. In SRL, light extraction is accomplished via evanescent coupling from the waveguide into several output waveguides.
We report on room-temperature continuous-wave operation and single-mode lasing of microdisk and microring lasers with radii as small as 7 mum. The waveguide sidewall roughness was minimized by an optimized fabrication process using hydrogen silsesquioxane e-beam resist and Cl 2-CH 3-H 2 inductively coupled plasma etching. The devices show unidirectional bistability between the counterpropagating modes...
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